Paper Title:
In Situ High-Resolution Observation for Decomposition of NaAlH4
  Abstract

NaAlH4 has a theoretical hydrogen capacity of 5.6 wt. % with two-step reaction, and the control of the reaction temperature and reversibility is a critical issue for onboard application. To clarify nano-structural details of decomposition of NaAlH4, the in-situ annealing experiment was carried out in a high resolution microscope. It was confirmed that NaAlH4 decomposed at between 200 and 300°C, resulted in formation of many gas bubbles at interface between the particle and oxide film. A reactive intermediate, Na3AlH6, may decompose in this temperature range. Sodium alanate particle was originally agglomeration of small nano-sized crystal with the size of 10 – 20 nm, and the crystal grain grew to 110 nm in diameter after completing decomposition at around 400°C. This is the first step for examination of the microstructural response of catalysts on hydrogen storage materials.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
1621-1624
DOI
10.4028/www.scientific.net/MSF.561-565.1621
Citation
H. Kawasaki, S. Ohnuki, T. Suda, N. Hashimoto, Y. Kojima, "In Situ High-Resolution Observation for Decomposition of NaAlH4", Materials Science Forum, Vols. 561-565, pp. 1621-1624, 2007
Online since
October 2007
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$32.00
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